1) you have purified a multisubunit extracellular protein that has a several int
ID: 90203 • Letter: 1
Question
1) you have purified a multisubunit extracellular protein that has a several interchain disulfide bonds, which amino acid residue would you expect to find at these disulfide bonds
a.proline
b.cysteine
c. glycen
d.choline
2) a protein kinase catalyzes the transfer of a ____ to a second protein.
a.Phosphate group.
b.Methyl group
c. Hydrocyl group
d. Fatty acid tail
3. what causes the pump to return to its original confirmation and releases the K+ into cytosolic space?
a.the pump is dephosphorylated
b. the pump is phosphorylated
c. adp is bound
d. atp is hydrolyzed
Explanation / Answer
Answer:
1. (b) cysteine
Explanation:
Cysteine is a sulfur containing amino acid.
The thiol side chain in cysteine often participates in enzymatic reactions, as a nucleophile. The thiol is susceptible to oxidization to give the disulfide derivative cystine, which serves an important structural role in many proteins.
2. (a) Phosphate group.
Explanation:
A kinase is an enzyme that catalyzes the transfer of phosphate groups from high-energy, phosphate-donating molecules to specific substrates.
3. (a) the pump is dephosphorylated
Explanation:
The pump binds 2 extracellular K+ ions. This causes the dephosphorylation of the pump, reverting it to its previous conformational state, transporting the K+ ions into the cell.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.